<style>
  html,
  body {
    height: 100%;
  }
  .search-container {
    position: absolute;
    top: 30%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
  }
  .search-container .search-box {
    display: flex;
  }
  .search-container img {
    margin-bottom: 30px;
  }
  .search-container .search-box input {
    width: 512px;
    height: 16px;
    padding: 12px 16px;
    font-size: 16px;
    margin: 0;
    vertical-align: top;
    outline: 0;
    box-shadow: none;
    border-radius: 10px 0 0 10px;
    border: 2px solid #c4c7ce;
    background: #fff;
    color: #222;
    overflow: hidden;
    box-sizing: content-box;
    -webkit-tap-highlight-color: transparent;
  }
  .search-container .search-box button {
    cursor: pointer;
    width: 112px;
    height: 44px;
    line-height: 41px;
    line-height: 42px;
    background-color: #ad2a27;
    border-radius: 0 10px 10px 0;
    font-size: 17px;
    box-shadow: none;
    font-weight: 400;
    border: 0;
    outline: 0;
    letter-spacing: normal;
    color: white;
  }
  body {
    background: no-repeat center /cover;
    background-color: #edf0f5;
  }
</style>

<div class="container" id="app">
<div class="search-container">
  <img src="https://www.itheima.com/images/logo.png" alt="">
  <div class="search-box">
    <input type="text" v-model="words" id="inp">
    <button>搜索一下</button>
  </div>
</div>
</div>

<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
const app = new Vue({
  el: '#app',
  data: {
    words: ''
  },
  // 核心思路
  // 1. 等input元素渲染出来之后才能去获取操作
  // 2. 让input 获取焦点  inp.focus()
  mounted() {
    document.querySelector('#inp').focus()
  }
})
</script>